JPS6153430A - Control unit for engine - Google Patents

Abstract

PURPOSE:To increase a degree of exhaust resistance in time of idling and make combustion better as well as to reduce HC content in exhaust gases, by connecting an on-off switch at a full-close position of a throttle operating body and throttling a throttle valve, while delaying ignition timing to some extent. CONSTITUTION:When a throttle operating body 1 is operated at a full-close position, making an engine into idling, a cam 3 comes off an on-off switch 2 so that this switch 2 is connected. If so, a servomotor 6 is driven and a throttle valve 5 turns round, throttling an exhaust passage 4. Simultaneously with this, an ignition unit 7 is made to delay its ignition timing so as to cause the ignition timing to come close to zero. As a result, exhaust resistance increases, making combustion better, thus HC content in exhaust gases is reducible. On the other hand, when the throttle operating body 1 is operated in a direction increasing an engine speed, the on-off switch 2 is disconnected by the cam 3, and the throttle valve 5 opens, while the ignition unit 7 is restored to its normal ignition timing so that normal driving is performable.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a control device for an engine mounted on a motorcycle or the like.

[Technical background and problems of the invention]

Engines emit exhaust gases during operation, and the exhaust gases contain harmful components such as TolC. The engine installed in a moving vehicle is moving while the vehicle is running, so the density of exhaust gas emitted is low. However, when the vehicle is stopped and the vehicle is driving, the density contained in the air is higher than when the vehicle is stopped. becomes higher as time passes. Particularly when the vehicle is stopped, the engine is often operated at idling, which is the lowest engine speed, and the HC concentration during idling becomes a problem.

[Purpose of the invention]

In view of the above, the present invention aims to reduce I-(C′cJI) contained in exhaust gas during engine fitting operation.
The purpose is to reduce the +111u extension at the time of ignition by combining the exhaust throttle valve and the ignition time.

[Structure of the invention]

Embodiments of the present invention shown in the drawings will be described below.

The throttle operating body 1 for operating the throttle valve of the carburetor is shown as a rotating hand grip type, but there is also a lever type. A cam 3 for operating the 17il closing switch 2 is mounted on one side of the throttle operating body 1.
is the provision. The cam 3 is separated from the open/close switch 2 when the throttle operating body 1 is in the fully closed position (idling state).
The opening/closing switch 2 is connected, and when the throttle operating body 1 is moved in the listening direction, the opening/closing switch 2 is opened. A throttle valve 5 is provided in the exhaust passage 4 of the engine, and the exhaust passage 4 is throttled by its rotation.
It is moved by a nervous motor 6. Open/close switch 2
is connected to the servo motor 6 and the ignition unit 7.

Therefore, when the throttle operating body 1 is in the fully closed position where the engine is idling, the cam 3 is connected to the open/close switch 2.
Separately, the open/close switch °2 is connected. This story 1″
! The servo motor 6 is driven by the connection signal from the J switch 2, and the throttle valve 5 rotates as shown by the two-dot chain line in the figure to throttle the exhaust passage 4. In addition, the connection signal of the open/close switch 2 (,1
For 1-point ignition unit, delay the ignition time so that the ignition time is around 0°. These two operations increase exhaust resistance, improve combustion, and reduce HCfJ in exhaust gas.
can reduce the degree of When the throttle operating body 1 is operated in the direction of increasing engine speed, the open/close switch 2 is turned off by the cam 3, the throttle valve 5 is turned off, and the ignition unit 7 is turned off.
Since the ignition time returns to normal, normal operation is possible.

〔Effect of the invention〕

J: As explained above, this invention provides a throttle valve in the exhaust passage, connects it to the servo motor, provides the throttle operating body with a 3-switch switch, and connects the switch to the servo motor and the ignition unit. Throttle operating body fully closed position 1
By connecting the open/close switch in step 4 to throttle the throttle valve and delay the ignition time, the exhaust resistance increases during idling, allowing for better combustion during idling with less exhaust m, reducing HC concentration. can. If you operate the throttle operating body to raise the engine speed, the close switch will turn off, the throttle valve will open, and the ignition time will return to normal, allowing the engine to run without any problems.

[Brief explanation of drawings]

The figure is a partial vertical sectional view showing one embodiment of the present invention. 1... Throttle operating body, 2... Open/close switch, 4
... Exhaust passage, 5... Throttle valve, 6... Servo motor, 7... Ignition unit.

Claims (1)

[Claims] A throttle valve is provided in the exhaust passage and connected to the servo motor, an opening/closing switch is provided on the throttle operating body, the opening/closing switch is connected to the servo motor and the ignition unit, and the opening/closing switch is connected when the throttle operating body is in the fully closed position to open the throttle. An engine control device characterized by throttling a valve and retarding ignition time.